| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] [prep] a | 12460 |
|
| 2 | then [vb base] [prep] | 1453 |
|
| 3 | then [prep] a | 495 |
|
| 4 | then [vb base] a | 472 |
|
